Thread-cutting tool



G. W. DOVER.

THREAD CUTTING TOOL.

APPLICATION FlLED JUNE 22.1921.

1,413,326@ Patented Apr. 18, 1922.

Fifi I N VEN TOR.

BY M +62 @5 W ATTORNEY.

.onbaqn wi novnnfor cmsromnnonn ISLAND, ASSIGNOR oparoaarnn acoaroiwrxon or more rsmmn p Be itiknownx-that'l, GEORGE: Doimii, a-

5 UNITED s fr-Ara 'symran'r. OFFICE.

T0 GEORGE W. DOVER,

' THREAD-CUTTING- rooL,

To all who rrjb' it mayboacerni'l citizen-of the United States, residing"at Gra'nst'on, in' the county of Providence" and, .fitate of RhodeIsland, have invented cer tain'- --new and useful-1 Improvements -1nThread-Cutting Tools,'of"'w' ich the followf in is aspec'ification. ywinvention: relates tothread cutting tools and its essential objectsjareto adapt the construction;'-.toi out any form of screw threads ,Htoafii'ord a plurality. of cutting points; toen'able both a deep cut and alight'or finishing cut; to permit cutting at any desired angle; toafford means for s'ecuring the'cuttmgmember inany position of angularadjustment; to enable the tool .to be used for both. right hand and,left

hand cutting; and to remove the possibility of strain upon the toolduring the cutting operation.

To the above ends essentially my invention consists in such parts and insuch com- 'binations of parts as fall'within the scope of the appendedclaims.

In the accompanying drawings wh1ch form a part of this specification, 1

Figure 1 is a side elevation of my novel Figures 2 and 3, endelevationsof the same, showing the cutter in left and right hand positionsrespectively,

Figure '4, a section on line 4-4 of Flgure 1 Figure 5, a bottom planview of the tool, Fi re 6, a section on line 6-6 of Figure 2, and

ure 1.

Like. reference characters indicate like parts throughout the views.

In the form of my invention herein illustrated 9 is a rectangularsupporting bar or shank rovided centrally of one end with a cylindricalstud 10. An approximately inverted U-shaped cutter holding member 11comprises a neck portion 12, an inner the tool holder ma threaded endFigure 7, asection on line 7- of Fig-- cavity 18 intermediate its lengthto receive end of the bolt shank 17 is a head or plate 21'preferablyspaced sli htl fromthe face' 10f .the member 13. g y i the member 13.The threaded end of the bolt projects and carr'es a nut 25 restingagainst awasher 26. By'tight'ening the nut 25 the-bolt is bound on thestud-10 whereby y be frictionally clamped inany axialposition, while thepin 23 in;

sures that the bolt remain in properrelation to the stud 10. The outerarm 14of the holder has a threaded opening 28 to accommodate a screw29having a threaded portion 30 in the opening 28, and an unortion 31adapted to enter a cavlty 32 in t e arm 13. An intermediate portion ofthe arm 14 has a boss 34in which is a transverse bolt hole 35 aroundwhich on each-face of the boss are radial corrugations 36. A circular.cutting member 38 is provided with a series of V shaped cutting points39, a central bolt hole 40, and radial corrugations 42 on each facearound the latter. A bolt 43 in the hole 35 has a head 44 overlappingthe cutting member. A washer 46 bears against the boss, and a nut 47 isscrew threaded into the bolt in, contact with the washer.

boss 34 for eit er right or of the member 13 f-have seats 19. Upon onespecification ol' liettei s Patent. i -Patented Apr. 18,1922

Upon the inner face of the-head 1s a pro ectlon or pin22 adapted toregister as a sliding fit in a hole 23 on Cutting members 3 8-mayv besubstituted foreach other, or locked-in" any adjusted osition on eitherside of they left hand thread:

The. neck portion 12 of the cutter holder l member has a transverselydisposed double tapering hole 49 forming a continuation of the space 50between the yoke arms 13 and 1.4. In one-end of this hole is a taperinghead 51provided with a threaded stem 52 which extends through a threadedcentral opening 53in a tapering nut '55 in the other end of the hole,and which terminates in a j. milled'flange or head 57. i The nut 55 may.

be used in conjunction with the screw 29.

For heavy cutting the arm 14 and screw 29 are in the position shown inFigure 6.

If cuts of less depth are, desired the screw j 29 is loosened to allowthe arm,14-space to] 4 yield towardsthe base of arm 13 under thepressure of the work. The degree of this yielding of the arm 14 is,however, controlled to an the nut 55,

desired degree by turning y tightening the latter more rigidity isimparted to the arm 14, giving jacent portion of the arm 13 to indicatethe v degrees of a circle described by the cutter ding member, 7

I claim 1. In a thread cutting tool, a shank, a stud on the shank, acutter holding member rotatably mounted on the stud, a bolt in themember provided witha transverse channel adapted to receive the stud,and a circular cutter supported by the cutter holding memher.

2. In a thread cutting tool, a shank, a stud on the shank, a cutterholding member mounted for rotatable movement on the stud and providedwith a cavity, a bolt comprising a body in said member provided with aperipheral channel adapted to receive the stud, and a head, a projectionon the head registerable in the cavity, a nut on the bolt, and a cuttersupported by the cutter holding member.

3. In a thread cuttin tool, a shank, a yoke shaped cutter hol ing membercomprising an arm supported for rotatable adjustment by the shank andprovided with a cavity, and a free arm, an adjusting screw in the freearm registerable in the cavity,

and a cutter supported by the free arm.

4. In a thread cutting tool, a shank, an inverted approximately U shapedcutter holding member having inner and outer arms, the inner arm beingrotatably sup-- surrounding the last mentioned hole, a bolt extendingthrough both holes, a head on the bolt engaging the cutter, a washer onthe bolt, and a nut on the boltengaging the washer for tightening thecutter.

5. In a thread cuttlng tool, a cutter holding member comprising a neck,an inner arm and a vibratory outer arm parallel with the inner arm andspaced therefrom, a shank supporting the inner arm at right anglesthereto, a set screw in the outer arm en-' gageable with the inner arm,a cutter rotatably mounted on an intermediate portion of the outer arm,sald neck being rovided with a transversely disposed doub e taper-;

ing hole communicating with the space between the arms, a tapering headin one end of the hole, a threaded stem on the head within the hole, anda tapering nut in the hole on the stem.

In testimony whereof I have aflixed my signature.

GEORGE w. DOVER.

